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help with this question....

This topic has 2 member replies
goncalo08 Junior | Next Rank: 30 Posts Default Avatar
Joined
18 Oct 2006
Posted:
11 messages

help with this question....

Post Sat Nov 18, 2006 5:29 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    a circular jogging track forms the edge of a circular lake that has a diameter of 2 miles. johanna walked once around the track at the average of 3 miles per hour. it T represents the number of hours it took her to walk completly around the lake which of the following is correct

    (a) 0.5 <T<0.75
    (b)1.75<T<2.0
    c 2.0<T<2.5
    d 2.5<T<3.0
    e 3.0<T<3.5

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    gamemaster Senior | Next Rank: 100 Posts Default Avatar
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    Posted:
    34 messages
    Post Sun Nov 19, 2006 7:23 am
    the distance she has to walk is 2*pi*r = 2pi =~ a little more than 6 miles
    she walk 3 miles in 1 hr ...

    gmat_enthus Senior | Next Rank: 100 Posts Default Avatar
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    Post Mon Nov 20, 2006 6:59 am
    ditance travelled = 2*pi*1 miles ~ 6.28 miles

    Average speed = 3 miles/hr

    T ~ 6.28/3 = 2.08

    Answer C

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